Trane SCWH User manual

Trane
Brand
Trane
Model
SCWH
Category
Split-system air conditioners
Type
User manual

This manual is also suitable for

PKG-SVX14A-EN
Installation, Operation, and
Maintenance
Midrange Self-Contained Units
October 2008
Models SCWH/SCRH
3, 5, 7.5, 10, 12, & 15-tons
“AO” and later design sequence
2 PKG-SVX14A-EN
general
information
About This Manual
Literature Change History
Use this manual for commercial self-
contained models SCWH and SCRH.
This is the original issue of this
manual. It provides specific installation,
owner maintenance, and diagnostic
troubleshooting instructions for “AO” and
later design sequences.
Note: The procedures discussed in this
manual should only be performed by
qualified, experienced HVAC technicians.
Note: This document is customer
property and must be retained for use by
maintenance personnel.
It is important to perform periodic
maintenance to help ensure trouble free
operation. Should equipment failure
occur, contact a qualified Trane service
organization for an experienced HVAC
technician to properly diagnose and
repair this equipment.
Warnings and Cautions
Warnings and cautions appear at
appropriate sections throughout this
manual. Read these carefully.
WARNING
Indicates a potentially hazardous
situation, which could result in death
or serious injury if not avoided.
CAUTION
Indicates a potentially hazardous
situation, which may result in minor or
moderate injury if not avoided. Also, it
may alert against unsafe practices.
CAUTION
Indicates a situation that may result in
equipment or property-damage-only
accidents.
Example Warnings and
Cautions
WARNING
Hazardous Voltage!
Disconnect all electric power,
including remote disconnects before
servicing.Follow proper lockout/tagout
procedures to ensure power cannot
be inadvertently energized. Failure to
disconnect power before servicing
could result in death or serious injury.
CAUTION
Use Copper Conductors Only!
Unit terminals are not designed to
accept other type conductors. Failure
to use copper conductors may result
in equipment damage.
Common HVAC Acronyms
For convenience, a number of acronyms
and abbreviations are used throughout
this manual. These acronyms are
alphabetically listed and defined below.
CFM = Cubic-feet-per-minute
CKT. = Circuit
CV = Constant volume
CW = Clockwise
CCW = Counterclockwise
E/A = Exhaust air
F/A = Fresh air
HGBP = Hot gas bypass
HVAC = Heating, ventilation and air
conditioning
IGV = Inlet guide vanes
I/O = Inputs/outputs
IOM= Installation/operation/maintenance
manual
LH = Left-hand
O/A = Outside air
psig = Pounds-per-square-inch, gauge
pressure
R/A = Return air
RH = Right-hand
RPM = Revolutions-per-minute
S/A = Supply air
SZ = Single-zone (unit airflow)
VAV = Variable air volume
w.c. = Water column
Special Note on Refrigeration
Emissions
World environmental scientists have
concluded that ozone in our upper
atmosphere is being reduced due to the
release of CFC fully halogenated
compounds.
Trane urges all HVAC service personnel
to make every effort to prevent any
refrigerant emissions while installing,
operating, or servicing equipment.
Always conserve refrigerants for
continued use.
© 2008 Trane All rights reserved
PKG-SVX14A-EN 3
contents
Cross reference to related publications/information:
Midrange Self-Contained catalog, PKG-PRC012-EN
Installation…………………………………………………2
general information ……………………………………………2
pre-installation considerations ………………………………6
dimensions & weights ………………………………………11
mechanical requirements ……………………………………17
electrical requirements ………………………………………19
installation procedure ………………………………………21
pre-startup requirements ……………………………………22
startup …………………………………………………………23
Operation…………………………………………………24
sequence of operation ………………………………………24
Maintenance ……………………………………………25
general information …………………………………………25
maintenance procedures ……………………………………26
periodic checklists ……………………………………………29
troubleshooting ………………………………………………30
typical wiring diagrams ……………………………………32
4 PKG-SVX14A-EN
Installation
general
information
Midrange Model Number Description
Following is a complete description of the midrange model number. Each digit in the model number has a corresponding code that
identifies specific unit options.
S C W H 075 4 2 A0 1 0 1 0
1 2 3 4 567 8 9 1011 12 13 14 15
Digit 1 - unit model
S = self contained
Digit 2 - unit type
C = commercial
Digit 3 - condenser medium
R = remote air-cooled
W = water cooled
Digit 4 - development sequence
H = development series
Digit 5, 6, 7- unit nominal capacity
030 = 3 tons
050 = 5 tons
075 = 7.5 tons
100 = 10 tons
120 = 12 tons
150 = 15 tons
Digit 8 - unit voltage
3 = 208 - 230 volt/60 hz/3 ph
4 = 460 volt/60 hz/3 ph
5 = 575 volt/60 hz/3 ph
Digit 9 - air flow configuration
2 = vertical discharge / front return
3 = vertical discharge / rear return
Digit 10, 11 - design sequence
A0 = design sequence
Digit 12 - air filter type
1 = one-inch fiberglass throwaway
Digit 13 - control
0 = control interface
Digit 14 - unit finish
1 = painted
2 = corrosion resistant coating
Digit 15 - coil finish/Cu-Ni Condenser
0 = none
E = evaporator coated (SCRH)
Unit Airflow Configurations
unit size discharge fan location comments
030/050/075 vertical CCW top standard
horizontal CW top field converted
100/120/150 vertical CCW top standard
vertical CW top field converted
horizontal CW top
vertical CW rear
horizontal CW rear
horizontal CCW rear
J = Cupronickel condenser &
Evaporator coated (SCWH)
PKG-SVX14A-EN 5
Installation
general
information
General
The midrange models SCWH/SCRH
is a high efficiency, vertical air
condioner. units have either front or top
discharge configuration options and easy
service access. Unit construction is heavy
gage steel with a baked enamel finish.
Available unit voltages are 208/3/60, 230/
3/60, 460/3/60, and 575/3/60.
Refrigeration Circuits
Units are configured in single or double
refrigeration circuits. Each circuit consists
of:
• high efficiency scroll compressor
mounted on rubber isolation grommets
• evaporator coils designed for optimum
performance and efficiency with lanced
fins and rifled tubing
• filter-drier
Evaporator Section
The evaporator fan section consists of
one or two forward curved centrifugal
fans powered by a premium efficiency
motor through an adjustable motor
sheave and fixed diameter blower pulley.
Controls
The standard control panel consists of a
high voltage terminal block, overload
relays for each fan motor, transformer, 3-
pole 24-volt contactors for eachmotor
and compressor, and a 5-second delay
timer. Remote thermostat controls are
field installed.
Field-Installed Accesories
These items ship separately for field
installation:
• steam coil
• hot water coil
• plenum
• oversized motors
• remote thermostat
Note: Application of the above options
and/or accessories may require field
adjustment of fan speeds to ensure
proper airflow and performance.
Unit Nameplate
The unit nameplate identifies the unit
model number, appropriate service
literature, and wiring diagrm numbers. It
is mounted on the control panel door.
Reference this information when making
inquires or ordering parts or literature.
Refrigerant Handling
Procedures
Environmental Accountability Policy
Trane urges that all HVAC servicers to
make every effort to eliminate, if possible,
or vigorously reduce the emission of CFC,
HCFC, and HFC refrigerants to the
atmosphere. Always act in a responsible
manner to conserve refrigerants for
continued usage even when acceptable
alternatives are available.
Recover and Recycle Refrigerants
Never release refrigerant to the
atmosphere! Always recover and/or
recycle refrigerant for reuse,
reprocessing (reclaimed), or properly
dispose if removing from equipment.
Always determine the recycle or reclaim
requirements of the refrigerant before
beginning the recovery procedure.
Obtain a chemical analysis of the
refrigerant if necessary. Questions about
recovered refrigerant and acceptable
refrigerant quality standards are
addressed in ARI Standard 700.
Refrigerant Handling and Safety
Consult the manufacturer’s material
safety data sheet (MSDS) for information
on refrigerant handling to fully
understand health, safety, storage,
handling, and disposal requirements. Use
the approved containment vessels and
refer to appropriate safety standards.
Comply with all applicable transportation
standards when shipping refrigerant
containers.
Service Equipment and Procedures
To minimize refrigerant emissions while
recovering refrigerant, use the
manufacturer’s recommended recycling
equipment per the MSDS. Use
equipment and methods which will pull
the lowest possible system vacuum while
recovering and condensing refrigerant.
Equipment capable of pulling a vacuum of
less than 1,000 microns of mercury is
recommended.
Do not open the unit to the atmosphere
for service work until refrigerant is fully
removed/recovered. When leak-testing
with trace refrigerant and nitrogen, use
HCFC-22 (R-22) rather than CFC-12 (R-
12) or any other fully-halogenated
refrigerant . Be aware of any new leak
test methods which may eliminate
refrigerants as a trace gas. Perform
evacuation prior to charging with a
vacuum pump capable of pulling a
vacuum of 1,000 microns of mercury or
less. Let the unit stand for 12 hours and
with the vacuum not rising above 2,500
microns of mercury.
A rise above 2,500 microns of mercury
indicates a leak test is required to locate
and repair any leaks. A leak test is
required on any repaired area.
Charge refrigerant into the equipment
only after equipment does not leak or
contain moisture. Reference proper
refrigerant charge requirements in the
maintenance section of this manual to
ensure efficient machine operation.
When charging is complete, purge or
drain charging lines into an approved
refrigerant container. Seal all used
refrigerant containers with approved
closure devices to prevent unused
refrigerant from escaping to the atmo-
sphere. Take extra care to properly
maintain all service equipment directly
supporting refrigerant service work such
as gauges, hoses, vacuum pumps, and
recycling equipment .
When cleaning system components or
parts, avoid using CFC-11 (R-11) or CFC-
113 (R-113). Use only cleaning-solvents
that do not have ozone depletion factors.
Properly dispose of used materials.
Refrigeration system cleanup methods
using filters and driers are preferred.
Check for leaks when excessive purge
operation is observed.
Keep abreast of unit enhancements,
conversion refrigerants, compatible
parts, and manufacturer’s recommenda-
tions that will reduce refrigerant emis-
sions and increase equipment operating
efficiencies.
6 PKG-SVX14A-EN
Pre-Installation Considerations
Pre-Installation Checklist
Complete the following checklist before
beginning unit installation.
Verify the unit size and tagging with the
unit nameplate.
Make certain the floor or foundation is
level, solid, and sufficient to support the
unit and accessory weights. Level or
repair the floor before positioning the
unit if neccesary.
Allow minimum recommended
clearances for routine maintenance and
service. Refer to unit submittals for
dimensions.
Allow three fan diameters above the
unit for the discharge ductwork. Return
air enters the rear of the unit and
conditioned supply air discharges
through the top.
Electrical connection knockouts are on
the top, left side of the unit.
Allow adequate space for piping
access and panel removal. Condenser
water piping, refrigerant piping, and
condensate drain connections are on
the lower left end panel.
Electrical supply power must meet
specific balance and voltage
requirements as described in the
“Electrical Requirements” section.
Water-cooled units only: The installer
is responsible for providing a condenser
main, standby water pump, cooling
tower, pressure gauges, strainers, and
all components for waterside piping.
See the “Water Piping” section for
general waterside recommendations.
Air-cooled units only: The installer is
responsible for providing and installing
the remote air-cooled condenser and
refrigerant piping, including filter driers.
Receiving and Handling
Shipping Package
Midrange units ship assembled on skids.
Units ship assembled, piped, and charged
with either R410a (model SCWH)
or a dry nitrogen charge (model SCRH).
Receiving Checklist
Complete the following checklist
immediately after receiving unit
shipment to detect possible shipping
damage.
Inspect individual cartons before
accepting. Check for rattles, bent carton
corners, or other visible indications of
shipping damage.
If a unit appears damaged, inspect it
immediately before accepting the
shipment. Make specific notations
concerning the damage on the freight
bill. Do not refuse delivery.
Inspect the unit for concealed damage
before it is stored and as soon as
possible after delivery. Report
concealed damage to the freight line
within the allotted time after delivery.
Check with the carrier for their allotted
time to submit a claim.
Do not move damaged material from
the receiving location. It is the receiver’s
responsibility to provide reasonable
evidence that concealed damage did
not occur after delivery.
Do not continue unpacking the
shipment if it appears damaged. Retain
all internal packing, cartons, and crate.
Take photos of damaged material if
possible.
Notify the carrier’s terminal of the
damage immediately by phone and
mail. Request an immediate joint
inspection of the damage by the carrier
and consignee.
Notify your Trane representative of
the damage and arrange for repair.
Have the carrier inspect the damage
before making any repairs to the unit.
Unit Storage
Take precautions to prevent condensate
from forming inside the electrical
compartments and motors if the unit is
stored before it is installed.
Service Access
Maintain adequate clearances around
and above the unit to ensure proper unit
operationa nd allow sufficient service
accesss. Trane recommends 36-inches
service access on all sides fo the unit.
Service access locations are shown in
figures on pages 8 through 9.
WARNING
Hazardous Voltage!
Disconnect all electric power, including
remote disconnects before servicing.
Follow proper lockout/tagout
procedures to ensure power cannot
be inadvertently energized. Failure to
disconnect power before servicing
could result in death or serious injury.
Installation Preparation
Before installing the unit, perform the
following procedures to ensure proper
unit operation.
1. Verify the floor or foundation is level.
Shim or repair as necessary. To ensure
proper unit operation, install the unit
level in both horizontal axes.
2. Allow adequate service and code
clearances as recommended in
“Service Access” section. Position the
unit and skid assembly in its final
location. Test lift the unit to determine
exact unit balance and stability before
hoisting it to the installation location.
See the “Proper Lifting Procedure”
section for proper rigging procedures
and cautions.
3. Remove the skids from under the unit.
If you find internal damage, file a claim
immediately to the delivering carrier.
4. Remove the protective shipping covers
from the unit.
5. Verify the compressor isolator shipping
brackets are removed and the isolators
are properly tightened for operation.
Installation
pre-installation
considerations
PKG-SVX14A-EN 7
Installation
pre-installation
considerations
24"
FAN ACCESS
FRONT RETURN
COIL / ELECTRIC HEATER
ACCESS
MOTOR / DRIVE ACCESS
(RIGHT SIDE)
CONTROL BOX &
CONDENSER FAN ACCESS
TXV ACCESS
(RIGHT SIDE)
26" SERVICE CLEARANCE
RIGHT SIDE
UNIT-MOUNTED T-STAT
OPENING (BOTH SIDES)
POWER ENTRY
(BOTH SIDES)
CONTROL ENTRY
(BOTH SIDES)
COMPRESSOR ACCESS
42" SERVICE CLEARANCE FRONT
DRAIN CONNECTION
AIR FILTER ACCESS
(BOTH SIDES)
(BOTH SIDES)
26" SERVICE CLEARANCE
LEFT SIDE
SIGHT GLASS/FILTER DRIER ACCESS
(RIGHT SIDE)
24"
26" SERVICE CLEARANCE
LEFT SIDE
REAR RETURN
18" SERVICE CLEARANCE
REAR
26" SERVICE CLEARANCE
RIGHT SIDE
10 through 15-ton SCWH/SRCH with top-mounted fan configuration
LATCH
HEATER
ACCESS
THIS PANEL GOES TO TOP ON
HORIZONTAL AIR DISCHARGE
CONFIGURATION
PROVIDED DISASSEMBLED
(FOR FIELD-INSTALLED REAR RETURN)
3 through 7.5-ton SCRH/SCWH
Service Access
8 PKG-SVX14A-EN
Installation
pre-installation
considerations
Service Access
10, 12, & 15-ton SCWH/SRCH
with side-mounted fan configura-
tion, field converted
10 through 15-ton SCRH/SCWH
PKG-SVX14A-EN 9
Installation
pre-installation
considerations
Table I-PC-1. Isolator load points, units with a vertical discharge configuration, lbs.
model L1 L2 L3 L4 L1 L2 L3 L4
SCRB/SIRB SCWB/SIWB
3-ton 99 105 120 127 105 133 118 124
5-ton 115 122 157 166 129 165 166 165
7.5-ton 154 203 227 221 177 234 230 231
10-ton 208 266 273 253 263 334 293 300
15-ton 243 332 359 356 315 388 382 375
Table I-PC-2. Isolator load points, units with a horizontal discharge configuration, lbs.
model L1 L2 L3 L4 L1 L2 L3 L4
SCRB/SIRB SCWB/SIWB
7.5-ton 250 108 313 135 285 126 319 140
10-ton 318 150 363 169 383 211 383 211
15-ton 404 166 510 210 514 215 514 215
Table I-PC-3. Isolator load points & types, units with a horizontal discharge, inverted “L”
configuration, lbs.
air-cooled models water-cooled models
L1 L2 L3 L4 L1 L2 L3 L4
10-ton unit 318 150 363 169 383 211 383 211
spring red yellow red yellow red yellow red yellow
rubber-in-shear green red green red green red green red
15-ton unit 404 166 510 210 514 215 514 215
spring purple yellow purple yellow purple yellow purple yellow
rubber-in-shear gray red gray red gray red gray red
Note: Units ship with two different color isolators and should be placed as depicted in this chart to properly support the
unit weight. See Figures I-PC-1 & I-PC-2 for correct isolator positions by unit size.
3, 5, & 7.5-ton units
bottom view of unit
1
7
/
8
1
7
/
8
7
/8” dia. hole under all 4 corners
Figure I-PC-1. Isolator mounting hole locations on 3, 5, &
7.5-ton units
10 & 15-ton units
bottom view of unit
1
3
/
8
3
3
/
4
9
/16” dia. hole under all 4 corners
Figure I-PC-2. Isolator mounting hole locations on 10 & 15-
ton units
L1
L3
L2 L4
L1
L3
L2 L4
Isolator Placement
Note: Isolators are field-provided.
10 PKG-SVX14A-EN
Proper Lifting Procedure
Follow these instructions and reference
Figure I-PC-3.
1. Slide a fork lift into the opening
provided on the unit base. Move the
fork lift carefully.
2. Using slings, attach through the circular
holes provided on the unit base. Protect
the unit from damage by rigging
equipment.
WARNING
Improper Unit Lift!
Test lift unit approximately 24 inches
high to verify the proper center-of-
gravity lift point. To avoid dropping the
unit, reposition the lifting point if the
unit is not level. Failure to properly lift
the unit could result in death, serious
injury, or possible equipment/
property-only damage.
Installation
pre-installation
considerations
Figure I-PC-3. Proper unit lifting procedure
PKG-SVX14A-EN 11
dimensions &
weightsInstallation
3 & 5-tons
SCWH/SCRH
SCRH
SCWH
vertical discharge
horizontal discharge
(field converted)
SCWH/SCRH dimensions & weight, in-lbs.
unit shipping operating
size A B C D E F G J K L M N O P Q R S weight weight
3 31.89 64.17 22.24 5.65 11.93 14.31 10.63 18.00 7.80 7.80 15.60 15.63 20.20 6.28 4.33 8.58 4.37 494 459
5 36.41 75.98 24.01 7.73 13.03 15.65 11.61 20.31 12.32 8.66 20.98 18.58 24.20 7.10 5.43 6.38 7.12 592 555
12 PKG-SVX14A-EN
dimensions &
weights
7.5-tons
SCWH/SCRH
Installation
SCWH
vertical discharge
horizontal discharge
(field converted)
SCWH/SCRH weight, lbs.
unit shipping operating
size weight weight
7.5 702 657
SCRH
PKG-SVX14A-EN 13
dimensions &
weightsInstallation
10, 12, & 15-tons with top-mounted fan configuration
SCWH/SCRH
horizontal discharge
(field converted)
vertical discharge
SCRH
SCWH
SCWH/SCRH dimensions & weight, in-lbs.
unit shipping operating
tons A B C D E F G J K M N weight weight
10 66.75 88.78 7.04 18.07 57.28 19.01 25.0 5.23 7.48
5
/
8
8.30 984 917
12 65.75 92.71 7.04 18.07 61.22 22.95 29.01 5.23 7.48
5
/
8
12.24 977 907
15 80.31 92.71 19.83 19.83 61.22 22.95 29.01 4.76 5.12
3
/
4
12.24 1098 1021
14 PKG-SVX14A-EN
10, 12, & 15-tons with side-mounted fan configuration, field converted
SCWH/SCRH
SCWH/SCRH Dimensions, in.
unit
tons A C D E F G
10 65.75 7.04 18.07 57.28 66.93 25.79
12 65.75 7.04 18.07 61.22 66.93 29.73
15 80.31 19.83 19.83 61.22 81.49 29.73
Notes:
1. Base rail must be attached to the floor before converting
unit to side-mounted fan configuration.
2. Coil or electric heater cannot be assembed inside the
cabinet with the side-mounted fan configuration.
dimensions &
weightsInstallation
PKG-SVX14A-EN 15
dimensions &
weightsInstallation
Plenum
Plenum dimensions & weight, in-lbs.
unit size A B weight
3-ton 31.89 22.24 44
5-ton 36.41 24.01 54
7.5-ton 40.94 28.74 73
10 & 12-ton 65.75 29.52 120
15-ton 80.31 29.52 146
A
B
C
D
E
F
G
0.39
0.28
1.38
1.38
5.91
1.57
3.15
0.39
0.59
0.59
2.18
2.18
8.39
1.03
1.03
1.08
0.75
0.75
5.9
1.0 NPT
Hot water coil
3 & 5-ton units
SCWH/SCRH Hot water coil dimensions & weights, 3 & 5-ton units, in-lbs.
size A B C D E F G weight
3-ton 26.46 18.98 25.67 5.79 5.79 10.00 12.76 13
5-ton 30.98 23.50 30.20 7.040 7.040 12.50 15.26 18
16 PKG-SVX14A-EN
dimensions &
weightsInstallation
A
B
D
C
0.43
0.28
0.39
0.39
1.03
1.03
1.08
1.57
3.19
0.75
0.75
5.90
1.00 NPT
1.38
1.38
17.50
20.26
1.38
8.27
2.18
0.599.54
9.54
15.89
2.18
9.07
7.48
0.59
BLOCKOFF (SHIPS DISASSEMBLED)
Hot water coil
10 thru 15-ton units
35.51
28.035.91
0.43
1.57
3.15
34.72
0.39
0.75
0.75
0.39
5.9
1.0 NPT
0.75
17.00
0.75
2.22
2.22
16.25
20.7
0.39
1.87
8.48
8.48
14.64
1.55
1.55
3.03
0.39
1.87
1.03
1.08
1.03
0.28
Hot water coil
7.5-ton units
SCWH/SCRH Hot water coil dimensions & weights, in-lbs.
size A B C D weight
7.5-ton - - - - 24
10-ton 58.72 50.98 6.95 59.51 49
12-ton 58.72 50.98 6.95 59.51 49
15-ton 73.29 63.98 8.52 74.07 55
PKG-SVX14A-EN 17
mechanical
requirements
Duct Connections
Install all air ducts according to the
National Fire Protection Association
standards for the “Installation of Air
Conditioning and Ventilation Systems
other than Residence Type (NFPA 90A)
and Residence Type Warm Air Heating
and Air Conditioning Systems (NFPA
90B).
Make duct connections to the unit with a
flexible material such as heavy canvas. If
a fire hazard exists, Trane recommends
using Flexweave 1000, type FW30 or
equivalent canvas. Use three inches for
the return duct and three inches for the
discharge duct. Keep the material loose
to absorb fan vibration.
Run the ductwork straight from the
opening for a minimum of three fan
diameters. Do not make abrupt turns or
transitions near the unit due to increased
noise and excessive static losses. Use
elbows with splitters or turning vanes to
minimize static losses.
Poorly constructed turning vanes may
cause airflow generated noise. Check
total external static pressures against fan
characteristics to be sure the required
airflow is available throughout the
ductwork.
WARNING
Hazardous Voltage!
Disconnect all electric power,
including remote disconnects before
servicing. Follow proper lockout/
tagout procedures to ensure power
cannot be inadvertently energized.
Failure to disconnect power before
servicing could result in death or
serious injury.
Water Piping
Condenser Connections
Note: To prevent water damage, install
piping drain and vent plugs.
Condenser water piping knockouts are in
the lower left end panel. If necessary,
remove insulation to gain access. All field
installed piping must conform to
applicable local, state, and federal codes.
To complete condenser water
connections follow the procedure below.
1. Remove back panel to access the
water connection fittings.
2. Attach the water supply line to the inlet
connection, and the return line to the
outlet connection. The water connection
fittings are copper, so exercise extreme
care when connecting steel piping to
copper fittings.
3. Ensure that water piping is aligned to
the unit connection fittings. Failure to
align piping could cause stripped
threads, leakage, and possible unit
failure.
4. Connection to the unit water piping
requires a backing wrench to prevent
distortion of connecting tubing. Apply
backing wrench to water connection
points on unit.
Condensate Drain Connections
Install a water regulating valve in the
water supply line to maintainhead
pressure when operating with city water
of varying temperature.
These units require a minimum water
pressure of 15 psig and will operate at a
maximum of 400 psig.
Provide safeguards against cold weather
drain line freeze.
Installation
Cooling Tower Piping
Cooling tower control affects the unit
cycle rates. Condenser water
temperature swings from 10-15°F may
cause excessive compressor, water
valve, and unit cycling. Be sure to set the
tower controls to minimize compressor/
unit cycling.
The cooling tower system requires a
separate drain in the water supply line for
service and repair.
Water Temperature Requirements
Install a water regulating valve in the
water supply line to maintain head
pressure when operating with water of
varying temperature. The valve
modulates condenser water flow to
control condensing pressure. The valve
opens or closes in response to
compressor discharge pressure as
sensed by its capillary line connection iin
the liquid line shrader valve. When the
valve is properly installed, water flow
automatically decreases as discharge
pressure falls and increases as discharge
pressure rises. Field installation of the
water regulating valve assembly
requires one valve for each refrigeration
circuit.
18 PKG-SVX14A-EN
mechanical
requirementsInstallation
Refrigerant Piping (Air-Cooled
Units Only)
Reference industry recommendations
for air-cooled unit refrigerant piping. If
suspending piping from the building, use
isolation hangers to prevent vibration
transmission.
Air-cooled units ship with a holding
charge of nitrogen. Before installing unit
piping, momentarily depress either the
suction or discharge line access valve to
verify that the holding charge has not
been lost. If nitrogen does not escape
when depressing the access valve, leak-
test the entire refrigerant system to
determine the source of loss.
The charge is contained by a continuous
loop of both hot gas and liquid lines. You
must cut the loop for connection to
discharge and liquid lines. See Figure I-
MR-1.
Brazing Procedures
Proper brazing techniques are essential
when installing refrigerant piping. Keep
the following factors in mind when
making sweat connections.
1. When heating copper in the presence
of air, copper oxide forms. To prevent
copper oxide from forming inside the
tubing during brazing, sweep an inert
gas, such as dry nitrogen, through the
tubing. Nitrogen displaces air in the
tubing and prevents oxidation of
interior surfaces. A nitrogen flow of one
to three cubic feet per minute is
sufficient to displace the air. Use a
pressure regulating valve or flow meter
to control the flow.
2. Ensure tubing surfaces that require
brazing are clean and the ends of the
tubes are carefully reamed to remove
any burrs.
3. Make sure the inner and outer tubes of
the joint are symmetrical and have a
close clearance, providing an easy slip
fit. If the joint is too loose, the tensile
strength of the connection will be
significantly reduced. Make the overlap
distance equal to the inner tube
diameter.
4. Wrap the body of each refrigerant line
component with a wet cloth to keep it
cool during brazing. Excessive heat can
damage the components.
5. If using flux, apply it sparingly to the
joint. Excess flux will contaminate the
refrigerant system.
6. Apply heat evenly over the length and
circumference of the joint, making sure
the entire joint becomes hot enough to
melt the brazing material.
7. Begin brazing when the joint is hot
enough to melt the brazing rod. The hot
copper tubing, not the flame, should
melt the rod.
8. Continue to apply heat around the joint
circumference until the brazing material
is drawn into the joint by capillary
action, making a mechanically sound
and gas-tight connection.
9. Visually inspect the connection after
brazing to locate any pin holes or
crevices in the joint. Use a mirror to
inspect connections that are difficult to
see.
Figure I-MR-1. Air-cooled unit refrigerant piping
WARNING:
Hazard of Explosion and Deadly
Gases!
Never solder, braze or weld on
refrigerant lines or any unit com-
ponents that are above atmo-
spheric pressure or where
refrigerant may be present.
Always remove refrigerant by fol-
lowing the guidelines estab-
lished by the EPA Federal Clean
Air Act or other state or local
codes as appropriate. After refrig-
erant removal, use dry nitrogen to
bring system back to atmospheric
pressure before opening system
for repairs. Mixtures of refriger-
ants and air under pressure may
become combustible in the pres-
ence of an ignition source leading
to an explosion. Excessive heat
from soldering, brazing or weld-
ing with refrigerant vapors
present can form highly toxic
gases and extremely corrosive
acids. Failure to follow all proper
safe refrigerant handling prac-
tices could result in death or seri-
ous injury.
Electrical Requirements
Follow these guidelines, referring to unit
wiring diagrams and supply power
dimensional information to ensure
correct electrical requirements at the
installation site. Reference supply power
wiring locations on unit submittals orin
the “Dimensions and Weights” section.
Specific unit wiring diagrams are
provided on each unit. Use these
diagrams for connections or trouble
analysis.
Unit Wiring Diagrams
Specific unit wiring diagrams are
provided on the inside of the control
panel door. Use these diagrams for
connections or trouble analysis.
PKG-SVX14A-EN 19
electrical
requirementsInstallation
Supply Power Wiring
It is the installer’s responsibility to provide
power supply wiring to the unit terminal
block or the non-fused disconnect switch
option. Wiring should conform to NEC and
all applicable code requirements.
1. Verify the power supply available is
compatible with the unit nameplate
ratings. The supply power must be
within 10%of the rated voltage listed on
the unit nameplate.
2. Reference the electrical data in Table I-
ER-1. Protect the electrical service from
over current and short circuit
conditions in accordance with NEC
requirements. Size protection devices
according to the electrical data on the
unit nameplate.
3. If using a field-supplied disconnect,
install it at or near the unit in
accordance with NEC. Do not mount a
field-supplied disconnect on the unit.
Reference the electrical service
entrance location on unit submittals.
4. Complete the unit power wiring
connections onto either the main
terminal block or the field-provided non-
fushed disconnect switch.
5. Provide proper unit grounding in
accordance with local and national
codes.
Electrical Data Calculations
RLA = rated load amps
Compressor LRA = locked rotor amps
Fan motor LRA = locked rotor amps,
N.E.C. Table 430 - 151
FLA = Full load amps, N.E.C.
Table 430 - 150
Voltage utilization range is ±10%
Minimum circuit ampacity (MCA)
= 1.25 x largest motor amps (FLA or
RLA) + the sum of the remaining motor
amps.
Maximum fuse size (MFS) and maximum
circuit breaker size (MCB) = 2.25 x largest
motor amps (FLA or RLA) + the sum of
the remaining motor amps.
Note: If the rating value determined does
not equal a standard current rating of
over current protective device, use the
next lower standard rating for the
marked maximum rating.
Voltage Range
Voltages must be within +- 10% the
nameplate voltage. Ensure the unit
voltage is balanced by measuring at the
compressor terminals. Voltage imbalance
on three phase systems can cause motor
overheating and premature failure.
Maximum allowable imbalance is 2.0%.
Voltage Imbalance
Read the voltage at the compressor
terminals to determine if it is balanced.
Voltage imbalance on three phase
systems can cause motor overheating
and premature failure. The maximum
allowable imbalance is 2.0%. Voltage
imbalance is defined as 100 times the
sum of the deviation of the three voltages
from the average (without regard to sign)
divided by the average voltage. For
example, if the three measured voltages
are 221, 230, and 227, the average
voltage would be:
(221 + 230 + 227) = 226 volts
3
The percentage of voltage imbalance is
then:
100 *
(226-221) = 2.2%
226
In this example, 2.2% imbalance is not
acceptable. Whenever a voltage
imbalance of more than 2.0% exists,
check the voltage at the unit disconnect
switch. If the imbalance at the unit
disconnect switch does not exceed 2.0%,
faulty unit wiring is causing the
imbalance. Conduct a thorough
inspection of the unit electrical wiring
connections to locate the fault, and make
any repairs necessary.
WARNING
Live Electrical Components!
During installation, testing, servicing,
and troubleshooting this equipment, it
may be necessary to work with live
electrical components. Have a
qualified licensed electrician or other
individual who is properly trained in
handling live electrical components
perform these tasks. Failure to follow
all electrical safety precautions when
exposed to live electrical components
could result in death or serious injury.
WARNING
Hazardous Voltage!
Disconnect all electric power,
including remote disconnects before
servicing. Follow proper lockout/
tagout procedures to ensure power
cannot be inadvertently energized.
Failure to disconnect power before
servicing could result in death or
serious injury.
CAUTION
Use Copper Conductors Only!
Unit terminals are not designed to
accept other type conductors. Failure
to use copper conductors may result
in equipment damage.
WARNING
Ground Wire!
All field-installed wiring must be
completed by qualified personnel.
All field-installed wiring must
comply with NEC and applicable
local codes. Failure to follow this
instruction could result in death
or serious injuries.
WARNING
Grounding Required!
Follow proper local and state elec-
trical code on requirements for
grounding. Failure to follow code
could result in death or serious in-
jury.
20 PKG-SVX14A-EN
electrical
requirements
Installation
RLA LRA qty. hp FLA qty. hp FLA qty
SC*H0303.... 208-230V/60Hz/3Ph 12.9 77.0
0.5
2.21
1
18.3 30 3.15 19.3 30
SC*H0304.... 460V/60Hz/3Ph 5.7 35.0 1.00 8.1 15 1.42 8.5 15
SC*H0305.... 575V/60Hz/3Ph 4.8 31.0 0.80 6.8 15 1.14 7.1 15
SC*H0503.... 208-230V/60Hz/3Ph 22.9 155.0 5.00 33.6 50 5.81 34.4 50
SC*H0504.... 460V/60Hz/3Ph 10.7 75.0 2.50 15.9 25 2.63 16.0 25
SC*H0505.... 575V/60Hz/3Ph 8.5 54.0 1.50 12.1 20 2.10 12.7 20
SC*H0753.... 208-230V/60Hz/3Ph 27.9 164.0 6.30 41.2 60 5.81 40.7 60
SC*H0754.... 460V/60Hz/3Ph 13.6 100.0 3.10 20.1 30 2.63 19.6 30
SC*H0755.... 575V/60Hz/3Ph 10.2 78.0 2.40 15.2 25 2.10 14.9 25
SC*H1003.... 208-230V/60Hz/3Ph 22.9 155.0 6.30 57.8 80 13.70 65.2 80
SC*H1004.... 460V/60Hz/3Ph 10.7 75.0 3.10 27.2 35 6.18 30.3 40
SC*H1005.... 575V/60Hz/3Ph 8.5 54.0 2.40 21.5 30 4.94 24.1 30
SC*H1203.... 208-230V/60Hz/3Ph 25.4 147.7 9.40 66.5 90 13.70 70.8 90
SC*H1204.... 460V/60Hz/3Ph 11.8 75.0 4.60 31.2 40 6.18 32.7 45
SC*H1205.... 575V/60Hz/3Ph 9.3 59.6 3.40 24.4 30 4.94 25.9 35
SC*H1503.... 208-230V/60Hz/3Ph 27.9 164.0 9.40 72.2 100 13.70 76.5 100
SC*H1504.... 460V/60Hz/3Ph 13.6 100.0 4.60 35.2 45 6.18 36.8 50
SC*H1505.... 575V/60Hz/3Ph 10.9 78.0 3.40 27.9 35 4.94 29.5 35
12 2
tons MFS / MCBmodel voltage
compressor evap. fan motor
min. circuit
am
p
acit
y
10 2 2 1
21
evaporator standard motor evaporator oversized motor
evap. fan motor
MFS /
MCB
min. circuit
am
p
acit
y
51
21
51
31 11
5111
7.5 1 2 1
31 51
15 2 3 1
Table I-ER-1. Model SCWH/SCRH electrical data
WARNING
Hazardous Voltage!
Disconnect all electric power,
including remote disconnects before
servicing. Follow proper lockout/
tagout procedures to ensure power
cannot be inadvertently energized.
Failure to disconnect power before
servicing could result in death or
serious injury.
CAUTION
Use Copper Conductors Only!
Unit terminals are not designed to
accept other type conductors. Failure
to use copper conductors may result
in equipment damage.
Notes:
1. Voltage range:
Nominal voltage 208 - 230V - acceptable range: 187 - 253V
Nominal voltage 460V - acceptable range: 414 - 506V
Nominal voltage 575V - acceptable range: 518 - 633V
2. Ampacity is calculated per UL formula, ampacity = (1.25 x compressor RLA + sum of the second compressor RLA (if
used) + evaporator motor FLA
3. Maximum fuse size is calculated per UL formula, MFS = (2.25 x compressor RLA) + sum of second compressor RLA (if
used) + evaporator motor FLA
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Trane SCWH User manual

Trane
Brand
Trane
Model
SCWH
Category
Split-system air conditioners
Type
User manual
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